diff --git a/sys/compat/linuxkpi/common/include/linux/hrtimer.h b/sys/compat/linuxkpi/common/include/linux/hrtimer.h
--- a/sys/compat/linuxkpi/common/include/linux/hrtimer.h
+++ b/sys/compat/linuxkpi/common/include/linux/hrtimer.h
@@ -55,11 +55,20 @@
 #define	hrtimer_try_to_cancel(hrtimer)	linux_hrtimer_try_to_cancel(hrtimer)
 #define	hrtimer_cancel(hrtimer)	linux_hrtimer_cancel(hrtimer)
 
+/* hrtimer_init() is replaced by hrtimer_setup() in Linux 6.15. */
+#if defined(LINUXKPI_VERSION) && LINUXKPI_VERSION < 61500
 #define	hrtimer_init(hrtimer, clock, mode) do {			\
 	CTASSERT((clock) == CLOCK_MONOTONIC);			\
 	CTASSERT((mode) == HRTIMER_MODE_REL);			\
 	linux_hrtimer_init(hrtimer);				\
 } while (0)
+#endif
+
+#define	hrtimer_setup(hrtimer, restart, clock, mode) do {	\
+	CTASSERT((clock) == CLOCK_MONOTONIC);			\
+	CTASSERT((mode) == HRTIMER_MODE_REL);			\
+	linuxkpi_hrtimer_setup(hrtimer, restart);		\
+} while (0)
 
 #define	hrtimer_set_expires(hrtimer, time)			\
 	linux_hrtimer_set_expires(hrtimer, time)
@@ -81,10 +90,20 @@
 bool	linux_hrtimer_active(struct hrtimer *);
 int	linux_hrtimer_try_to_cancel(struct hrtimer *);
 int	linux_hrtimer_cancel(struct hrtimer *);
+/*
+ * The corresponding `hrtimer_init()` was dropped in Linux 6.15, thus the "#if
+ * LINUXKPI_VERSION < 61500" above. We keep this prototype here though because
+ * the underlying `linux_hrtimer_init()` is used by `linuxkpi_hrtimer_setup()`.
+ */
 void	linux_hrtimer_init(struct hrtimer *);
+void	linuxkpi_hrtimer_setup(struct hrtimer *hrtimer,
+	    enum hrtimer_restart (*function)(struct hrtimer *));
 void	linux_hrtimer_set_expires(struct hrtimer *, ktime_t);
 void	linux_hrtimer_start(struct hrtimer *, ktime_t);
 void	linux_hrtimer_start_range_ns(struct hrtimer *, ktime_t, int64_t);
 void	linux_hrtimer_forward_now(struct hrtimer *, ktime_t);
 
+enum hrtimer_restart linuxkpi_hrtimer_dummy_timeout(struct hrtimer *unused);
+#define	hrtimer_dummy_timeout(hrtimer) linuxkpi_hrtimer_dummy_timeout(hrtimer)
+
 #endif /* _LINUXKPI_LINUX_HRTIMER_H_ */
diff --git a/sys/compat/linuxkpi/common/src/linux_hrtimer.c b/sys/compat/linuxkpi/common/src/linux_hrtimer.c
--- a/sys/compat/linuxkpi/common/src/linux_hrtimer.c
+++ b/sys/compat/linuxkpi/common/src/linux_hrtimer.c
@@ -105,6 +105,23 @@
 	callout_init_mtx(&hrtimer->callout, &hrtimer->mtx, 0);
 }
 
+enum hrtimer_restart
+linuxkpi_hrtimer_dummy_timeout(struct hrtimer *unused __unused)
+{
+	return (HRTIMER_NORESTART);
+}
+
+void
+linuxkpi_hrtimer_setup(struct hrtimer *hrtimer,
+    enum hrtimer_restart (*function)(struct hrtimer *))
+{
+	linux_hrtimer_init(hrtimer);
+	if (function != NULL)
+		hrtimer->function = function;
+	else
+		hrtimer->function = linuxkpi_hrtimer_dummy_timeout;
+}
+
 void
 linux_hrtimer_set_expires(struct hrtimer *hrtimer, ktime_t time)
 {